John,
Is there tubing inside the well or is it just the casing? For my shallow well, I was able to pull the tubing out by hand but used a monkey wrench to fit around the tubing for support against the top of the casing while I grabbed another hold just above the wrench. Also if the well does have some depth and the tubing is steel, you could use the pipe wrench as a gripping force and pull up using its leverage but may need a second pipe wrench to hold the tubing up just above the casing. Just a thought.
